JP3303444B2 - Recording or playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus and a reproducing apparatus for a disk-shaped recording medium such as an optical disk and a magneto-optical disk.

[0002]

2. Description of the Related Art There is known a system in which an optical disk or a magneto-optical disk is used as a recording medium and a user can reproduce or record / reproduce music data and the like. It is widely used as a disc / player / recorder.

When data is reproduced from a disk in these recording / reproducing apparatuses, the disk surface is irradiated with laser light by an optical head, the reflected light is detected, and the data (reproduced RF signal) is read. But
In order to properly perform the laser irradiation, the optical head is driven by the objective lens position to perform tracking servo and focus servo, and a thread servo for driving the optical head in the disk radial direction is executed.

Meanwhile, between a ROM-type optical disk in which information is formed in a pit form and a magneto-optical disk in which a magneto-optical area is prepared so that a user can write information, a recording / reproducing operation for the recording / reproducing is performed. The operation mode (tracking operation mode) is different. Therefore, in a recording / reproducing apparatus corresponding to a disk having both a pit area and a magneto-optical area, the tracking operation mode must be switched.

When the disk is a magneto-optical disk on which a user can record music, for example, as shown in FIG. 7A, a pit area (read-only ROM)
Area), and TOC information (P-TOC) for managing the attributes of the disk and the recorded data is recorded in a pit form. Subsequently, an MO (magneto-optical) area is provided, and this MO area is provided with management information (U-T
General data such as OC) and music can be recorded.

[0006] A wobbling groove is formed in the MO area, and the groove has address information such as FM.
Due to the wobbling (meandering) by the modulated signal, even in an area where no data is recorded,
Address information (absolute position information) can be extracted from reflected light information based on the wobbling groove. At the time of data recording, since there is no address as data, the recording operation is controlled by the address information obtained from the wobbling groove.

As shown in FIG. 7 (b), there is also a hybrid type disc, in which data such as a P-TOC and music is recorded in a pit area as read-only data, and a U-TOC and music such as music are recorded. Can be recorded in the MO area. In other words, ROM data and rewritable data coexist as data to be recorded (such as music).

As described above, there is no compatibility with respect to a data reading method for a disk in which a pit area and an MO area coexist. Therefore, when data is read from each area, the system of the recording / reproducing apparatus is used. The controller controls the tracking operation mode to be switched according to the area to be scanned by the optical head. For example, for the disc shown in FIG. 7A, when the disc is loaded, the tracking operation mode is first set to the pit mode to read the TOC information, and when data such as music is actually recorded / reproduced, the optical head is used. Is appropriately moved to the outer peripheral side of the disk, and the tracking operation mode is set to the MO mode so that data can be read. Then, recording / reproduction of music or the like is performed by accessing a predetermined position by the read address data.

[0009]

However, in such a recording / reproducing apparatus for a magneto-optical disk, it is not possible to determine whether the area actually being scanned is a pit area or an MO area. In some cases, the data cannot be read.

For example, when data is read from the MO area of the disk, a disturbance such as shock or vibration is given to the apparatus, or a large error occurs in the read data for some reason, and the optical head causes an error. Assume that laser scanning has entered the pit area.

As described above, since the tracking operation mode is different between the pit area and the MO area, if the pit area enters the pit area in the mode corresponding to the MO area, for example, it is impossible to perform an appropriate tracking operation. If the tracking operation cannot be performed normally, data cannot be read, that is, the recording / reproducing apparatus cannot return to the normal operation without knowing the cause. This means that the optical head moves from the pit area to M
The same applies to the case where the user enters the O region.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and makes it possible to discriminate between an MO area and a pit area, and to perform a process when a tracking operation mode is not appropriate. It is an object of the present invention to provide a recording or reproducing apparatus which is configured as described above.

Therefore, a pit area is used as an information recording mode.
Disk-shaped record consisting of two types of information recording format, MO and MO area
By switching the tracking operation mode between reading the information in the area of the first recording mode and reading the information in the area of the second recording mode, the areas of the first and second recording modes are read. in recording or reproducing apparatus having a data reading means capable of reading information corresponding to each of the data reading unit reads
The decoded signal to generate a playback output signal.
In addition, it is possible to generate a read data signal interruption detection signal.
The data reading means is set as a tracking operation mode corresponding to one recording mode area on a disc-shaped recording medium provided with both the first and second recording mode areas. When an information reading operation is performed, information reading is performed based on the interruption detection signal.
There is provided control means for performing control so as to switch the tracking operation mode to a mode corresponding to the area of the other recording mode by detecting the impossibility .

The information recording mode includes a pit area and M
Disc-shaped recording medium having two information recording modes of O region
When reading the information of the area of the first recording mode in the body
And when reading the information of the area of the second recording mode.
By switching the racking operation mode,
And information corresponding to each of the areas of the second recording mode.
Record or readout with data reading means
In the raw device, the data reading means may read the read signal.
Signal to generate a playback output signal
Generates an interrupt detection signal for the read data signal, and
A lock that controls the operation of the thread mechanism based on the output signal
To be able to generate signals
Provided with both the first and second recording mode areas.
The data reading means is provided for a disc-shaped recording medium.
Tracking operation mode corresponding to the recording type area
When the information reading operation is executed as
By detecting that the information cannot be read based on the
The racking operation mode corresponds to the area of the other recording
Can be controlled to switch to a different mode
The control means Ru is provided.

In addition, a pit area and an information recording form
Disk-shaped recording consisting of two information recording modes in MO area
When reading the information of the area of the first recording mode on the medium
And when reading the information of the area of the second recording mode.
By switching the tracking operation mode, the first
And information corresponding to each of the areas of the second recording mode
A record provided with a data reading means that can be read or
In the reproducing apparatus, the data reading unit reads the read data.
Decoding the signal to generate a playback output signal
A read data signal interruption detection signal can be generated
And the first and second notes
For disc-shaped recording media with both recording areas
The data read means corresponds to the area of one of the recording forms.
Information reading operation as the tracking operation mode
Information reading based on the interruption detection signal.
If the information for detecting the function cannot be read, the tracking
Operation mode to the mode corresponding to the area of the other recording mode.
Control means capable of performing control so that
However, the address information is stored only in the area of the first recording mode.
Disc recorded on the disc by groove means
When the recording medium is a shape recording medium, the control means
The reading means is provided for a track corresponding to the area of the first recording mode.
The information reading operation is executed as the king operation mode.
The address recorded by the groove means
Because part of the information is no longer available,
It is determined that the function has been completed .

[0016]

When a recording / reproducing operation is performed on a disc having the first and second areas, if the disc enters the other area for some reason and a normal reading operation of information cannot be performed, By switching the tracking operation mode, the reading operation in that area becomes possible, and the fact that it becomes possible can be used as the current area determination information. If the current area can be determined and the data can be read, corresponding processing such as a return to a normal operation can be performed.
Further, when it is desired to know in which area the optical head is located at the time of start-up or the like, if the optical head is operated in one of the tracking operation modes and the appropriate state cannot be obtained, the mode is switched to obtain the appropriate state. By detecting that the area has been detected, the area can be determined.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the recording or reproducing apparatus according to the present invention will be described below with reference to FIGS. This embodiment is a recording / reproducing apparatus capable of performing operations corresponding to a magneto-optical disk and an optical disk.

In FIG. 1, reference numeral 1 denotes a magneto-optical disk or an optical disk, and the disk 1 is driven to rotate by a spindle motor 2. Reference numeral 3 denotes an optical head for irradiating a laser beam to the disk 1 at the time of recording / reproducing, and a high-level laser output for heating a recording track to the Curie temperature at the time of recording at the magneto-optical disk, A relatively low level laser output for detecting data from the reflected light is provided by the magnetic Kerr effect.

The disc 1 includes a read-only premastered disc (optical disc) composed entirely of pit information, and a recordable / reproducible disc in which TOC information is formed by pits and music and user TOC are magneto-optically recorded. (Magneto-optical disk), and as the magneto-optical disk, there is a hybrid disk in which a pit track and a magneto-optical track are also formed as audio data tracks of music or the like.

In an optical disk and a pit area which is a part of a magneto-optical disk, data is recorded in the form of a pit like a CD, whereas the optical head 3 is not a magnetic Kerr effect but a CD player. In the same manner as described above, a reproduced RF signal is extracted in accordance with a change in reflected light level due to the presence or absence of a pit. Of course, the magnetic field recording operation described later is not executed on the pit area of the optical disk and the magneto-optical disk.

In order to read data from the disk 1 in this manner, the optical head 3 has a laser diode as a laser output unit, an optical system including a deflection beam splitter and an objective lens, and a detector for detecting reflected light. A detector is mounted. The objective lens 3a is held by a two-axis mechanism 4 so as to be displaceable in a radial direction of the disk and in a direction toward and away from the disk, and the entire optical head 3 is movable in a radial direction of the disk by a sled mechanism 5.

Reference numeral 6 denotes a magnetic head for applying a magnetic field modulated by the supplied data to the magneto-optical disk, and is arranged at a position facing the optical head 3 with the disk 1 interposed therebetween.

The information detected from the disk 1 by the optical head 3 by the reproducing operation is supplied to the RF amplifier 7. The RF amplifier 7 performs an arithmetic operation on the supplied information,
Groove information serving as a reproduction RF signal (EFM signal), tracking error signal, focus error signal, absolute position information (absolute position information recorded as a pre-groove (wobbling groove) on the magneto-optical disk 1), and focus information (FOK signal) ) Etc. are extracted. Then, the extracted reproduced RF signal (EFM signal) is supplied to the encoder / decoder unit 8. Further, the tracking error signal and the focus error signal are supplied to the servo circuit 9.

The servo circuit 9 receives the supplied tracking error signal, focus error signal, track jump command and access command from the system controller 11,
Various servo drive signals are generated by a spindle servo control signal or the like to control the two-axis mechanism 4 and the thread mechanism 5 to perform focus and tracking control, and to control the spindle motor 2 to a constant linear velocity (CLV).

The reproduced RF signal is supplied to the encoder / decoder 8
Then, decoding processing such as EFM demodulation and CIRC is performed, and is temporarily written into the buffer RAM 13 by the memory controller 12. The reading of data from the magneto-optical disk 1 by the optical head 3 and the transfer of reproduced data from the optical head 3 to the buffer RAM 13 are performed at 1.41 Mbit / sec (intermittently).

The data written in the buffer RAM 13 is read out at a timing when the transfer of the reproduction data becomes 0.3 Mbit / sec, and is supplied to the encoder / decoder 14. Then, the signal is subjected to reproduction signal processing such as decoding processing for the audio compression processing, converted into an analog signal by the D / A converter 15, supplied from the terminal 16 to a predetermined amplifier circuit section, and reproduced and output. For example, they are output as L and R audio signals.

The data read from the disk 1 is once intermittently written into the buffer RAM 13 at a high rate, and read out at a low rate to output a sound. Thus, a so-called shock proof function is realized in which the sound output is continued without interruption even if the data cannot be read from the memory.

The absolute position information obtained by decoding the groove information or the address information recorded as data, which is output from the address decoder 10, is supplied to the system controller 11 via the encoder / decoder section 8, and various types of information are provided. Used for control operation. Further, the encoder / decoder unit 8 further supplies synchronization signal detection information, a servo monitor signal, a GFS signal (guard frame sync signal), a lock signal, and the like to the system controller 11. The GFS signal and the lock signal will be described later.

When a recording operation is performed on the disk (magneto-optical disk) 1, the recording signal (analog audio signal) supplied to the terminal 17 is converted to an A / D converter 18.
After that, the digital data is supplied to the encoder / decoder section 14 and subjected to audio compression encoding processing. The recording data compressed by the encoder / decoder unit 14 is once written into the buffer RAM 13 by the memory controller 12, read out at a predetermined timing, and sent to the encoder / decoder unit 8. Then, the encoder / decoder unit 8 performs CIRC encoding, E
After being subjected to encoding processing such as FM modulation, it is supplied to the magnetic head drive circuit 15.

The magnetic head drive circuit 15 supplies a magnetic head drive signal to the magnetic head 6 according to the encoded recording data. That is, the magnetic head 6 causes the magnetic head 6 to apply an N or S magnetic field. At this time, the system controller 11 supplies a control signal to the optical head 3 so as to output a laser beam at a recording level.

Reference numeral 19 denotes an operation input unit provided with keys for user operation, and reference numeral 20 denotes a display unit constituted by, for example, a liquid crystal display.

In the magneto-optical disk 1, data for managing an area where data such as music and the like and an unrecorded area are recorded are recorded as TOC information. At the time when the disc 1 is loaded, immediately before the recording or reproducing operation, or the like, the system controller 11 drives the spindle motor 2 and the optical head 3 and, for example, the TOC area set on the innermost side of the disc 1 To extract the data. Then, the RF amplifier 7, the encoder /
The TOC information supplied to the memory controller 12 via the decoder unit 8 is stored in a predetermined area of the buffer RAM 13 and is subsequently used for controlling the recording / reproducing operation on the disk 1.

In the recording / reproducing apparatus shown in FIG. 1, data can be read for both pit information and MO information on the disk 1. In order to realize this, a tracking operation mode is used. A pit-compatible mode and an MO-compatible mode are prepared, and are switched according to the area.

FIG. 2 shows each tracking operation mode.
This will be described with reference to FIG. FIG. 2 shows a detector portion in the optical head 3. In the optical head 3, as a detector for detecting the reflected light of the laser beam emitted from the laser diode to the disk 1, a quadrant detector 41 (A, B, C, D) and a side spot detector 42 (E, F) as shown in the figure. ), RF detector 43
(I, J) are provided. 44 is a three-beam Wollaston prism is provided to detect the polarization direction of the reflected light L _B. The three-beam Wollaston prism 44 is formed by laminating two uniaxial crystals, and separates beams in three directions according to the difference in the incident polarization direction.

The separated three beams form an image on the quadrant detector 41 and the RF detectors 43, 43. The laser diode irradiates the disk 1 with a beam serving as a main spot and also irradiates a pair of side spots. Light reflected by the side spots forms images on the side spot detectors 42 and 42.

In contrast to the provision of the detectors 41, 42, and 43, the RF amplifier 7 generates the various signals described above through various arithmetic processes. As shown in FIG. 3, first, the focus error signal FE and the groove information GRV are generated from the four-divided detector 41.
That is, the adder 45 performs the operation of A + D, and the adder 4
In B6, the operation of B + C is performed.
The calculation of (A + D)-(B + C) is executed to generate the focus error signal FE. As described above, the focus error signal FE is supplied to the servo circuit 9.

In the adder 48, A + B and the adder 49
In C, the operation of C + D is performed, and (A +
B)-(C + D) is calculated, that is, a push-pull signal is extracted. This push-pull signal is supplied to the address decoder 10 as groove information GRV.
Address information recorded as a wobbling groove in the O area is demodulated. This groove information GRV is also used for generating a spindle control signal during operation in the MO area.

With respect to the tracking error signal TE,
The subtractor 51 performs the calculation of EF and generates the result. However, the reflected light of the side spot applied to the edge of the pit in the pit area is detected by the detector 42, and the tracking error signal obtained as EF and the tracking error signal similarly obtained from the edge of the wobbling groove in the MO area. Means that the polarity is reversed.

Therefore, the output of the subtracter 51 is used as it is as the tracking error signal TE corresponding to the pit area. In the MO area, the output of the subtractor 51 whose polarity is inverted by the inverting circuit 53 is the tracking error signal. Used as TE. Therefore, the switching unit 52
Mode from the system controller 11 control signal S _{MO DE}
By, T _P terminal is connected at the time of scanning of the pit area,
Also during scanning of the MO area is switched to T _M terminals are connected. That is, the tracking operation mode is switched according to the area.

In either case of the MO area or the pit area, the reproduced RF signal is extracted from the detectors 43. The adder 54 calculates I + J, and extracts a reproduced RF signal as a sum signal, that is, a reproduced RF signal corresponding to the pit area. IJ is calculated by the subtractor 55,
A reproduction RF signal as a difference signal, that is, a reproduction RF signal corresponding to the MO region is extracted.

Then, the switching section 56 controls the mode control signal S
_MODE T _P terminal is connected at the time of scanning of the pit area by, also during scanning in the MO region by being switched to T _M terminals are connected, it is properly reproduced RF signals corresponding to respective areas output, The data is supplied to the encoder / decoder 8.

As described above, the encoder / decoder 8 generates a GFS signal and a lock signal and supplies them to the system controller 11. These signals will be described with reference to FIG. FIG. 4A shows a GFS signal, and FIG.
4B shows a reproduced RF signal, FIG. 4C shows a tracking error signal, FIG. 4D shows a thread error signal, and FIG.
Is a lock signal.

The servo circuit 9 is provided with a thread runaway prevention circuit so that the runaway operation of the thread mechanism can be lock-controlled based on the supplied lock signal. That is, when the lock signal falls to the L level as shown in FIG. 4E, the servo circuit 9 is configured to lock the thread drive. Here, the lock signal is generated based on a GFS signal (guard frame sync) as an interruption detection signal of the reproduction RF signal.

The GFS signal goes high when the frame synchronization signal extracted from the reproduced RF signal and the reference synchronization signal generated from, for example, the crystal oscillator output are locked, and goes low when the synchronization is lost. Signal.
That is, the GFS signal is a signal for detecting that the reproduction RF signal cannot be read properly.

Normally, the system controller 11 constantly monitors the GFS signal. However, if the reproduction RF signal is lost due to a scratch on the disk or the servo comes off, the GFS signal becomes L level. Therefore, when the system controller detects that the GFS signal is at the L level, the system controller can execute appropriate processing such as muting the audio output.

Here, the lock signal for muting the thread servo as described above is set so that the thread mute is not performed unnecessarily due to a scratch on the disk or the like.
It is generated only when the L level of the GFS signal continues to some extent. For example, T shown in FIG.
Assuming that the loss of the reproduced RF signal at _one point is caused by a scratch on the disk, the GFS signal also falls to the L level in this case. Of course, in such a case, it is not appropriate that the thread mute is executed.

Therefore, the L level period of the GFS signal is counted for the lock signal, and the lock signal (L level) is generated when the L level continues for 66 msec, for example. That is, when the fell at T ₂ to L level GFS signal, first lock signal at time T ₃ is to fall to L level. This 66 msec corresponds to a case where the frame synchronization signal of 13.3 msec is not detected five times. In this case, when the frame synchronization signal is lost five or more times, the lack of the RF signal at this time indicates that the servo is off. Is determined to be due to

In any case, by monitoring the GFS signal or the lock signal, the system controller 1
No. 1 can detect that the reproduction RF signal could not be read. As described above, when scanning the MO area, the address is reproduced from the groove information GRV. The monitor signal AdH of the header at this address is also supplied to the system controller 11, and during scanning of the MO area, the address is reproduced. If the header is no longer detected,
It can also be determined that the reproduction RF signal cannot be read.

In the encoder / decoder section 8, a lock signal is generated based on the GFS signal as described above, and the GFS signal or the lock signal is used, or an error in the reproduced data cannot be corrected. The audio mute signal is generated and output using the detection signal of the case.

In the recording / reproducing apparatus of the present embodiment having the above-described configuration, the scanning area is determined for the magneto-optical disk having the pit area and the MO area, and the corresponding processing can be performed accordingly. I have. FIG. 5A showing this operation by the system controller 11.
This will be described with reference to FIG.

FIG. 5A shows the processing in the case where the reproducing operation is being performed on the pit area in the pit mode, that is, the system controller 11 sets the switching unit 5 shown in FIG.
It is controlled to a state where T _P terminal is connected by the mode control signal S _MODE against 2,56. During the operation in the pit mode (F100), the system controller 11 constantly monitors whether or not the data has been properly read by the reproduced RF signal (F101).

Various monitoring methods are conceivable. For example, when the above-mentioned GFS signal continuously goes low for a certain period, the lock signal goes low, or a mute signal is output. Then, the occurrence of the data readable state is detected based on the fact.

When the reproduction data is properly read, the reproduction processing in the pit mode (that is, the reading of the P-TOC or the operation of reproducing the data by the pit in the hybrid disc) is continued (F101 → F100).

However, it is assumed that the optical head 3 accidentally enters the MO area due to, for example, disturbance.
That is, in this case, data cannot be read due to tracking control being disabled. In other words, conversely, when the data cannot be read, it can be determined that there is a possibility that the area has moved accidentally. Therefore, the process proceeds from step F101 to F102, and first, the tracking servo is turned off.
Then, set the tracking operation mode to MO mode (F10
3). In other words, the system controller 11 controls the switching units 52 and 56 in FIG. 3 so that the terminal T _M is connected by the mode control signal S _MODE . Then, the tracking servo is turned on (F104), for example, step F1
Determines whether data was read in the same way as 01
(F105).

If the data cannot be read out due to the fact that the optical head 3 has entered the MO area, the optical head 3 is switched to the MO mode.
Immediately after the data has entered the MO area, tracking is properly performed in the MO area, and data can be read. That is, the processing is performed in steps F105 to F106.
And it is determined that the user has actually entered the MO area.

If it is possible to recognize that the player has accidentally entered the MO area, it is possible to respond to the return to the pit area accordingly, and a predetermined response process is executed (F107).
Of course, in this corresponding process, the current position in the MO area can be read, so that the address position can be determined, and the servo is in a stable state, so that the return operation is easy. For example, the current address is determined, the distance to the pit area is calculated, and the access is performed. Then, the process of switching to the pit mode can be easily performed.

If data cannot be read in step F105, data is lost due to other causes, not due to movement between areas, and a predetermined process is performed (F108). In this case, for example, the mode is returned to the pit mode again and the predetermined processing is performed.

FIG. 5B shows the processing when the recording operation or the reproducing operation is performed in the MO mode in the MO mode, that is, the system controller 11 controls the switching units 52 and 56 in FIG. The control signal S _MODE is used to control the connection of the T _M terminal. Even during the operation in the pit mode (F200), the system controller 11 constantly monitors whether or not the data has been properly read by the reproduced RF signal (F201).

As this monitoring method, for example, G
Based on the fact that the FS signal has been continuously at the L level for a certain period, the lock signal has been at the L level, or the mute signal has been output, the occurrence of the data read disabled state is detected. Alternatively, it can be detected depending on whether or not the header of the address data obtained from the groove information GRV has been detected.

When the reproduction data is properly read, the reproduction processing in the MO mode (that is, reading / rewriting of U-TOC or recording / recording of data such as music as MO data) is performed as it is.
Playback operation) is continuing (F201 → F200).

However, if the optical head 3 accidentally enters the pit area due to the influence of a disturbance or the like, in this case, the tracking servo becomes impossible and the data cannot be read. Also in this case, conversely, the fact that the data cannot be read can be determined to indicate that there is a possibility that the area has been accidentally moved. Therefore, the process proceeds from step F201 to F202, and first, the tracking servo is turned off.
Subsequently, the tracking operation mode is set to the pit mode (F
203). That is, the system controller 11 sends the mode control signal S _MODE to the switching units 52 and 56 in FIG.
To control the _TP terminal to be connected. Then, turn on the tracking servo (F204), for example, step
It is determined whether or not data reading has been performed by means similar to F201 (F205).

If the data cannot be read due to the actual entry into the pit area from the MO area, the optical head 3 enters the pit area due to the pit mode. Immediately after the recording, tracking is performed well in the pit area, and data can be read. That is, the process can proceed from step F205 to F206, and it is determined that the user has actually entered the pit area.

If it is possible to recognize that the vehicle has accidentally entered the pit area, it is possible to respond to the return to the MO area accordingly, so that a predetermined response process is executed (F207).
Of course, in the corresponding process, the current position in the pit area can be read, so that the address position can be determined, and since the servo is in a stable state, the return operation becomes easy. For example, it is possible to easily calculate the distance from the current address to the MO area, execute access, and switch to the MO mode.

If data cannot be read in step F205, data is lost due to other causes, not due to movement between areas, and predetermined processing is performed (F208). In this case, for example, the mode is returned to the MO mode again and the predetermined processing is performed.

By performing the above processing, the recording / reproducing apparatus of the present embodiment can operate even if the scanning position of the optical head 3 accidentally moves between the pit area and the MO area during operation. It is possible to satisfactorily return to the proper operation state, and the error state does not continue without being able to read. And, since the restoration process can be executed quickly in this way, for example, by the above-mentioned shock proof function, if the reproduction is resumed and the reproduction operation is resumed while the reproduction sound output is continued, the reproduction sound may be interrupted. Absent. That is, it is possible to prevent the effect of the accident of the movement between the regions from occurring at all.

In the processing shown in FIG. 5, switching of the tracking operation mode is performed as one of the processings for the return operation. However, the switching of the tracking operation mode can be executed simply as means for determining the current area. .

That is, when the current position of the optical head 3 is unknown to the system controller 11 when the power is turned on, for example, while the tracking operation mode is switched alternately, in which mode the data can be read. Is detected, the area can be determined. In other words, if the data can be read in the pit mode, the current position can be determined to be the pit area, and if the data can be read in the MO mode, the current position can be determined to be the MO area. Processing can be performed. For example, P-TOC at power on
Is read, but if the current position can be confirmed, it is possible to efficiently reach the P-TOC area by accessing a predetermined distance. Therefore, for example, an operation of forcibly contacting the optical head with the innermost wall to obtain positional accuracy and then starting reading is unnecessary.

Next, a second embodiment of the present invention will be described with reference to FIG. The configuration of the recording / reproducing apparatus is shown in FIGS.
The description is omitted because it is the same as that of FIG. In this embodiment, the playback R
It is determined whether or not movement between regions has occurred according to the level of the F signal.

That is, if it is assumed that the reproduced RF signal obtained when reproducing the pit area in the pit mode is within a certain appropriate level range, the reproduced RF signal enters the MO area in the pit mode as it is. It is a fairly small level. On the other hand, when the reproduced RF signal obtained when reproducing the MO area in the MO mode is within a certain appropriate level range, if the reproduced RF signal enters the pit area as it is in the MO mode, the reproduced RF signal becomes infinite. The closer they are, the more they are amplified. The reproduced RF signal obtained from the I-J difference signal is
1 compared to the reproduced RF signal obtained from the sum signal of I + J
This is because a gain of 0 or more is given.

From the level difference of the reproduced RF signal,
The processing of FIG. 6 corresponding to the level detection can be executed. In other words, when the pit area is reproduced in the pit mode (F300, F301), if the RF signal level becomes lower than a predetermined value, it can be determined that the apparatus has entered the MO area, so that tracking is turned off at this time. Then, the tracking operation mode is switched to the MO mode, the tracking is turned on, and the RF level is checked again (F302, F303, F304, F305). Then, if the RF level is within the appropriate range in step F305,
It can be determined that it has entered the MO area (F306), and tracking and data reading can be performed by operation in the MO mode, and a corresponding process can be executed (F307). If the RF level is smaller than the appropriate value in step F305, the process is performed as an error due to another cause (F308).

Also, when the MO area is reproduced in the MO mode (F400, F401), if the RF signal level becomes considerably higher than a predetermined value, it can be determined that the pit area has been entered. Turns off the tracking, switches the tracking operation mode to the pit mode, turns on the tracking, and looks at the RF level again (F402, F403, F404,
F405). If the RF level is within the appropriate range in step F405, it can be determined that the vehicle has entered the pit area.
(F406) The tracking and data reading are performed by the operation in the pit mode, and the corresponding processing can be executed (F407). If the RF level is smaller than the appropriate value in step F405, the process is performed as an error due to another cause (F408).

In this embodiment, the same effect as in the first embodiment can be obtained. Of course, this method may be used, for example, for area determination at the time of startup.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be variously modified. In any case, by switching the tracking operation mode, and at that time, determining whether the data can be read or not or determining the RF reproduction level, it is sufficient that the area can be determined. Various possible. Further, in the embodiment, the recording / reproducing apparatus is described as an example, but the present invention can be applied to a recording-only apparatus or a reproduction-only apparatus.

[0074]

As described above, the recording / reproducing apparatus of the present invention, when performing a recording / reproducing operation on a disc having the first and second areas, enters the other area for some reason. If the information cannot be read normally and the normal reading operation cannot be performed, the tracking operation mode is switched, so that the reading operation in that area becomes possible and the reading becomes possible by There is an effect that the region can be determined. Then, since the current area can be determined and the data can be read, corresponding processing such as a return to a normal operation can be performed.

Further, when it is desired to know in which region the optical head is located at the time of start-up or the like, if the optical head is operated in one of the tracking operation modes and an appropriate state cannot be obtained, the mode is switched to an appropriate one. By detecting that the state has been obtained, the area can be determined, and the subsequent operation can be performed quickly.

[Brief description of the drawings]

FIG. 1 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a detector configuration in an optical head of the recording / reproducing apparatus according to the embodiment.

FIG. 3 is an explanatory diagram of an RF amplifier in an embodiment.

FIG. 4 is an explanatory diagram of a GFS signal and a lock signal generated in the embodiment.

FIG. 5 is a flowchart of a tracking operation mode switching process in the first embodiment.

FIG. 6 is a flowchart of a tracking operation mode switching process in the second embodiment.

FIG. 7 is an explanatory diagram of a magneto-optical disk and a hybrid type magneto-optical disk.

[Description of Signs] 1 disk 2 spindle motor 3 optical head 7 RF amplifier 8 encoder / decoder unit 9 servo circuit 10 address decoder 11 system controller 52, 56 switching unit

Claims (3)

(57) [Claims] 1. A pit area and an MO area as information recording modes.
Disk-shaped recording medium consisting of two information recording forms
When reading the information of the area of the first recording mode in
By switching the tracking operation mode in the case of reading the information of the area of the second recording format, comprising a data reading means capable of reading information corresponding to the respective regions of the first and second recording mode In a recording or reproducing apparatus, the data reading means decodes the read signal.
To generate a reproduction output signal and read data signal.
Interrupt detection signal can be generated.
In addition, for a disk-shaped recording medium provided with both the first and second recording modes, the data reading means performs a data reading operation as a tracking operation mode corresponding to one recording mode area. When executed , the interruption detection signal
A recording / reproducing apparatus provided with control means capable of performing control so as to switch the tracking operation mode to a mode corresponding to the area of the other recording mode by detecting that information cannot be read based on . 2. A pit area and an MO area as information recording modes.
Disk-shaped recording medium consisting of two information recording forms
When reading the information of the area of the first recording mode in
When reading the information of the area of the second recording format,
By switching the king operation mode, the first and second
Read information corresponding to each of the areas of the second recording mode
Recording or reproducing apparatus having data reading means
In location, said data reading means, the read signal decoding
To generate a reproduction output signal and read data signal.
Generate an interruption detection signal, and further based on the interruption detection signal
Generating a lock signal to control the operation of the thread mechanism.
And a disk having both the first and second recording modes.
And to disk-shaped recording medium, one of said data reading means
Set the tracking operation mode corresponding to the recording mode area.
When the information read operation is performed by the
Detecting the information readout failure based on the
Change the King operation mode to the mode corresponding to the area of the other recording
Control that can be controlled to switch to the mode
A recording or reproducing apparatus characterized by comprising means. 3. A pit area and an MO area as information recording modes.
Disk-shaped recording medium consisting of two information recording forms
When reading the information of the area of the first recording mode in
When reading the information of the area of the second recording format,
By switching the king operation mode, the first and second
Read information corresponding to each of the areas of the second recording mode
Recording or reproducing apparatus having data reading means
In location, said data reading means, the read signal decoding
To generate a reproduction output signal and read data signal.
Interrupt detection signal can be generated.
And a disk having both the first and second recording modes.
For the disk-shaped recording medium, the data reading means
Set the tracking operation mode corresponding to the recording mode area.
When the information reading operation is performed by the
Information read out is detected based on
If the tracking operation mode is set to the area of the other recording mode
Control to switch to the mode corresponding to
Control means for enabling address information to be displayed only in the first recording mode area.
Disk record recorded on the disk by groove means
When the recording medium is a recording medium, the control means reads the data.
Means for tracking the area corresponding to the first recording mode
The information reading operation is being executed as the
Contains address information recorded by the groove means.
Information cannot be read because some of the
Recording or reproducing apparatus characterized in that the
Place.